Speak with the squad sheltering nearby, and head through the tunnels into the volcano. At the marked objective, a cinematic will play where the vigil corpses disappear. Explorer Bekk will conclude that the vigil in the volcano were an illusion, and you now need to return to the starting location.

If you choose to fight with the squad, know that they are not particularly tough and their frontliners die quickly and will need to be occasionally revived. Remember to let them regenerate health between groups of destroyers where possible. However, fighting the enemies is optional, and you can just run past them directly to the objectives. The NPCs accompanying you are not needed to trigger the cinematic or end the mission - you can safely leave them behind if you choose to run.

I rescued the surviving members of Tactician Syska's squad from Mount Maelstrom. It was far from a routine mission, however, since someone set up an ambush designed to kill us deep inside the mountain. Even Syska's own soldiers suspected her, and I set out to find Trahearne to tell him the Pact may have a traitor in its midst.